Device for measuring heart rate



FIG. 1 is a perspective view of a device for measuring heart rate, showing my new design;

FIG. 2 is a perspective view thereof, flipped upside-down;

FIG. 3 is a front view thereof;

FIG. 4 is a side view thereof, the other side being a mirror image;

FIG. 5 is a top plan view thereof; and,

FIG. 6 is a bottom plan view thereof.

The broken lines illustrate portions of the device for measuring heart rate that form no part of the claimed design. 

CLAIM The ornamental design for a device for measuring heart rate, as shown and described. 